Помогите с математикой 6 класс

x^3-4x^2-11x+30=0

x1=-3

x^3-4x^2-11x+30 |x+3

x^3+3x^2 x^2-7x+10

-7x^2-11x

-7x^2-21x

10x+30

10x+30

0

x^2-7x+10=0

x2=2

x3=5

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x^3+4x^2-7x-10=0

x1=2

x^3+4x^2-7x-10 |x-2

x^3-2x^2 x^2 +6x+5

6x^2-7x

6x^2-12x

5x-10

5x-10

0

x^2+6x+5=0

x2=-1

x3=-5